[PATCH 1/2] examine: allows to examine a disk metadata onnon-metadata compliant systems

From 0f2d6c1d9d0d09ef99515b3df036878dd2b0f2aa Mon Sep 17 00:00:00 2001
From: Marcin Labun
Date: Tue, 22 Mar 2011 17:21:22 +0100
Subject: [PATCH 1/2] examine: allows to examine a disk metadata on non-metadata compliant systems

Allow for loading metadata from disk attached to non-metadata compliant
system. Affects mdadm --examine and guess_super.

Added ignore_hw_compat in supertype to pass information to load_super
handler. If ignore_hw_compat is set the handler should load metadata
also from disks that do not comply with metadata requirements (i.e. disk is not
attached to native controller, etc).

Signed-off-by: Marcin Labun
---
Examine.c | 2 ++
mdadm.h | 6 +++++-
util.c | 3 +++
3 files changed, 10 insertions(+), 1 deletions(-)

diff --git a/Examine.c b/Examine.c
index f949646..5d71e53 100644
--- a/Examine.c
+++ b/Examine.c
@@ -87,6 +87,7 @@ int Examine(struct mddev_dev *devlist, int brief, int export, int scan,
st = guess_super(fd);
if (st) {
err = 1;
+ st->ignore_hw_compat = 1;
if (!container)
err = st->ss->load_super(st, fd,
(brief||scan) ? NULL
@@ -98,6 +99,7 @@ int Examine(struct mddev_dev *devlist, int brief, int export, int scan,
if (!err)
have_container = 1;
}
+ st->ignore_hw_compat = 0;
} else {
if (!brief) {
fprintf(stderr, Name ": No md superblock detected on %s.\n", devlist->devname);
diff --git a/mdadm.h b/mdadm.h
index fa5af3a..8277594 100644
--- a/mdadm.h
+++ b/mdadm.h
@@ -827,7 +827,11 @@ struct supertype {
int container_dev; /* devnum of container */
void *sb;
void *info;
-
+ int ignore_hw_compat; /* used to inform metadata handlers that it should ignore
+ HW/firmware related incompatability to load metadata.
+ Used when examining metadata to display content of disk
+ when user has no hw/firmare compatible system.
+ */
struct metadata_update *updates;
struct metadata_update **update_tail;

diff --git a/util.c b/util.c
index 8e1b737..ef4406a 100644
--- a/util.c
+++ b/util.c
@@ -1196,6 +1196,7 @@ struct supertype *guess_super_type(int fd, enum guess_types guess_type)
if (guess_type == guess_partitions && ss->add_to_super != NULL)
continue;
memset(st, 0, sizeof(*st));
+ st->ignore_hw_compat = 1;
rv = ss->load_super(st, fd, NULL);
if (rv == 0) {
struct mdinfo info;
@@ -1211,9 +1212,11 @@ struct supertype *guess_super_type(int fd, enum guess_types guess_type)
if (bestsuper != -1) {
int rv;
memset(st, 0, sizeof(*st));
+ st->ignore_hw_compat = 1;
rv = superlist[bestsuper]->load_super(st, fd, NULL);
if (rv == 0) {
superlist[bestsuper]->free_super(st);
+ st->ignore_hw_compat = 0;
return st;
}
}
--
1.6.4.2

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